Rock out with the Baton Rouge Gem & Mineral Society this weekend. Their Gem & Mineral Show—held at the Lamar-Dixon Expo Center—offers two days of door prizes, a silent auction, demonstrations on faceting and wire wrapping, and vendors selling rock specimens, fossils, minerals, tools, and jewelry. 10 am‒5 pm. $5 adults; $3 for children ages 5–12; 4 and under free; Military with ID also free; scouts in uniform get in for $1 off. 9030 South St. Landry Avenue. brgemandmineral.org.